From patchwork Tue Sep 26 22:57:26 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 9972821 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 87107602BD for ; Tue, 26 Sep 2017 23:03:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7C3D028F11 for ; Tue, 26 Sep 2017 23:03:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7012A28FFB; Tue, 26 Sep 2017 23:03:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 04FC028F11 for ; Tue, 26 Sep 2017 23:03:53 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id DC3A821F322C4; Tue, 26 Sep 2017 16:00:39 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=192.55.52.115; helo=mga14.intel.com; envelope-from=dan.j.williams@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 2FA6721F322B4 for ; Tue, 26 Sep 2017 16:00:37 -0700 (PDT) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Sep 2017 16:03:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.42,441,1500966000"; d="scan'208"; a="1199378178" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.125]) by fmsmga001.fm.intel.com with ESMTP; 26 Sep 2017 16:03:50 -0700 Subject: [PATCH 3/3] libnvdimm, pfn: make 'resource' attribute only readable by root From: Dan Williams To: linux-nvdimm@lists.01.org Date: Tue, 26 Sep 2017 15:57:26 -0700 Message-ID: <150646664593.6588.2636887097527637750.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <150646662980.6588.6123788075203842948.stgit@dwillia2-desk3.amr.corp.intel.com> References: <150646662980.6588.6123788075203842948.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.17.1-9-g687f MIME-Version: 1.0 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , linux-kernel@vger.kernel.org, stable@vger.kernel.org Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP For the same reason that /proc/iomem returns 0's for non-root readers and acpi tables are root-only, make the 'resource' attribute for pfn devices only readable by root. Otherwise we disclose physical address information. Fixes: f6ed58c70d14 ("libnvdimm, pfn: 'resource'-address and 'size'...") Cc: Reported-by: Dave Hansen Signed-off-by: Dan Williams --- drivers/nvdimm/pfn_devs.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 9576c444f0ab..65cc171c721d 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -282,8 +282,16 @@ static struct attribute *nd_pfn_attributes[] = { NULL, }; +static umode_t pfn_visible(struct kobject *kobj, struct attribute *a, int n) +{ + if (a == &dev_attr_resource.attr) + return 0400; + return a->mode; +} + struct attribute_group nd_pfn_attribute_group = { .attrs = nd_pfn_attributes, + .is_visible = pfn_visible, }; static const struct attribute_group *nd_pfn_attribute_groups[] = {